Hmmm.
Used wisely, this could work. I understand having only 2 players in a group is unfair on the 4 group world, but with a bit of tweaking it could fill the world up with VIP's (of that player), if the hole group isn't filled, it would only be fair to fill the rest of the group up with normal players.
I've always wanted a system that could link you up to other players you are friends with, instead of being ranked depending on when you joined server and what position you filled.
I kinda like the idea, if it can be done fairly, I'll try get it going.